I don't know about the forms you are talking about, but if you want to put a permanent crease in pants use vinegar and water.

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Make a more permanent crease by mixing 1 part water to 1 part white vinegar and spraying the solution on a thin cloth. Iron the pants through the cloth--do not spray the solution directly onto the pants. Iron until the cloth is dry; then remove the cloth and let the pants dry in place on the ironing board.